face 3 LIBG3D Library face Face manipulation #include <g3d/face.h> #define G3D_FLAG_MAT_TWOSIDE #define G3D_FLAG_FAC_NORMALS #define G3D_FLAG_FAC_TEXMAP G3DFace; gboolean g3d_face_get_normal (G3DFace *face, G3DObject *object, G3DFloat *nx, G3DFloat *ny, G3DFloat *nz); void g3d_face_free (G3DFace *face); A face is plane bordered by at least 3 vertices. G3D_FLAG_MAT_TWOSIDE#define G3D_FLAG_MAT_TWOSIDE (1L << 0) Faces using this material should be rendered two-sided as the direction is unknown. G3D_FLAG_FAC_NORMALS#define G3D_FLAG_FAC_NORMALS (1L << 0) The face has custom normals. G3D_FLAG_FAC_TEXMAP#define G3D_FLAG_FAC_TEXMAP (1L << 1) The face has a texture map and texture coordinates. G3DFacetypedef struct { guint32 vertex_count; guint32 *vertex_indices; G3DMaterial *material; guint32 flags; G3DVector *normals; G3DImage *tex_image; guint32 tex_vertex_count; G3DVector *tex_vertex_data; } G3DFace; An object representing a surface. guint32 vertex_count; number of vertices guint32 *vertex_indices; indices of vertices in G3DObject G3DMaterial *material; material to use for surface guint32 flags; flags G3DVector *normals; optional normal array (one vector - 3 G3DVector values - for each vertex) G3DImage *tex_image; optional texture image guint32 tex_vertex_count; number of texture vertices, should be 0 or match vertex_count G3DVector *tex_vertex_data; array of texture vertices g3d_face_get_normalgboolean g3d_face_get_normal (G3DFace *face, G3DObject *object, G3DFloat *nx, G3DFloat *ny, G3DFloat *nz); calculates the normal of a face. face : face to calculate normal of object : object containing vertices of face nx : x component of resulting normal ny : y component of resulting normal nz : z component of resulting normal Returns : TRUE on success, FALSE else g3d_face_freevoid g3d_face_free (G3DFace *face); Frees all memory allocated for this face. face : the face to free